1 //! This module contains `HashStable` implementations for various HIR data
2 //! types in no particular order.
4 use crate::hir::map::DefPathHash;
5 use crate::ich::{Fingerprint, NodeIdHashingMode, StableHashingContext};
6 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
8 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_INDEX};
9 use smallvec::SmallVec;
13 impl<'ctx> rustc_hir::HashStableContext for StableHashingContext<'ctx> {
15 fn hash_def_id(&mut self, def_id: DefId, hasher: &mut StableHasher) {
17 hcx.def_path_hash(def_id).hash_stable(hcx, hasher);
21 fn hash_hir_id(&mut self, hir_id: hir::HirId, hasher: &mut StableHasher) {
23 match hcx.node_id_hashing_mode {
24 NodeIdHashingMode::Ignore => {
27 NodeIdHashingMode::HashDefPath => {
28 let hir::HirId { owner, local_id } = hir_id;
30 hcx.local_def_path_hash(owner).hash_stable(hcx, hasher);
31 local_id.hash_stable(hcx, hasher);
36 fn hash_body_id(&mut self, id: hir::BodyId, hasher: &mut StableHasher) {
38 if hcx.hash_bodies() {
39 hcx.body_resolver.body(id).hash_stable(hcx, hasher);
43 // The following implementations of HashStable for `ItemId`, `TraitItemId`, and
44 // `ImplItemId` deserve special attention. Normally we do not hash `NodeId`s within
45 // the HIR, since they just signify a HIR nodes own path. But `ItemId` et al
46 // are used when another item in the HIR is *referenced* and we certainly
47 // want to pick up on a reference changing its target, so we hash the NodeIds
50 fn hash_item_id(&mut self, id: hir::ItemId, hasher: &mut StableHasher) {
52 let hir::ItemId { id } = id;
54 hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
55 id.hash_stable(hcx, hasher);
59 fn hash_impl_item_id(&mut self, id: hir::ImplItemId, hasher: &mut StableHasher) {
61 let hir::ImplItemId { hir_id } = id;
63 hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
64 hir_id.hash_stable(hcx, hasher);
68 fn hash_trait_item_id(&mut self, id: hir::TraitItemId, hasher: &mut StableHasher) {
70 let hir::TraitItemId { hir_id } = id;
72 hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
73 hir_id.hash_stable(hcx, hasher);
77 fn hash_hir_mod(&mut self, module: &hir::Mod<'_>, hasher: &mut StableHasher) {
79 let hir::Mod { inner: ref inner_span, ref item_ids } = *module;
81 inner_span.hash_stable(hcx, hasher);
83 // Combining the `DefPathHash`s directly is faster than feeding them
84 // into the hasher. Because we use a commutative combine, we also don't
85 // have to sort the array.
86 let item_ids_hash = item_ids
89 let (def_path_hash, local_id) = id.id.to_stable_hash_key(hcx);
90 debug_assert_eq!(local_id, hir::ItemLocalId::from_u32(0));
93 .fold(Fingerprint::ZERO, |a, b| a.combine_commutative(b));
95 item_ids.len().hash_stable(hcx, hasher);
96 item_ids_hash.hash_stable(hcx, hasher);
99 fn hash_hir_expr(&mut self, expr: &hir::Expr<'_>, hasher: &mut StableHasher) {
100 self.while_hashing_hir_bodies(true, |hcx| {
101 let hir::Expr { hir_id: _, ref span, ref kind, ref attrs } = *expr;
103 span.hash_stable(hcx, hasher);
104 kind.hash_stable(hcx, hasher);
105 attrs.hash_stable(hcx, hasher);
109 fn hash_hir_ty(&mut self, ty: &hir::Ty<'_>, hasher: &mut StableHasher) {
110 self.while_hashing_hir_bodies(true, |hcx| {
111 let hir::Ty { hir_id: _, ref kind, ref span } = *ty;
113 kind.hash_stable(hcx, hasher);
114 span.hash_stable(hcx, hasher);
118 fn hash_hir_visibility_kind(
120 vis: &hir::VisibilityKind<'_>,
121 hasher: &mut StableHasher,
124 mem::discriminant(vis).hash_stable(hcx, hasher);
126 hir::VisibilityKind::Public | hir::VisibilityKind::Inherited => {
127 // No fields to hash.
129 hir::VisibilityKind::Crate(sugar) => {
130 sugar.hash_stable(hcx, hasher);
132 hir::VisibilityKind::Restricted { ref path, hir_id } => {
133 hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
134 hir_id.hash_stable(hcx, hasher);
136 path.hash_stable(hcx, hasher);
142 impl<'a> ToStableHashKey<StableHashingContext<'a>> for DefId {
143 type KeyType = DefPathHash;
146 fn to_stable_hash_key(&self, hcx: &StableHashingContext<'a>) -> DefPathHash {
147 hcx.def_path_hash(*self)
151 impl<'a> HashStable<StableHashingContext<'a>> for LocalDefId {
153 fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
154 hcx.def_path_hash(self.to_def_id()).hash_stable(hcx, hasher);
158 impl<'a> ToStableHashKey<StableHashingContext<'a>> for LocalDefId {
159 type KeyType = DefPathHash;
162 fn to_stable_hash_key(&self, hcx: &StableHashingContext<'a>) -> DefPathHash {
163 hcx.def_path_hash(self.to_def_id())
167 impl<'a> HashStable<StableHashingContext<'a>> for CrateNum {
169 fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
170 hcx.def_path_hash(DefId { krate: *self, index: CRATE_DEF_INDEX }).hash_stable(hcx, hasher);
174 impl<'a> ToStableHashKey<StableHashingContext<'a>> for CrateNum {
175 type KeyType = DefPathHash;
178 fn to_stable_hash_key(&self, hcx: &StableHashingContext<'a>) -> DefPathHash {
179 let def_id = DefId { krate: *self, index: CRATE_DEF_INDEX };
180 def_id.to_stable_hash_key(hcx)
184 impl<'a> ToStableHashKey<StableHashingContext<'a>> for hir::ItemLocalId {
185 type KeyType = hir::ItemLocalId;
188 fn to_stable_hash_key(&self, _: &StableHashingContext<'a>) -> hir::ItemLocalId {
193 impl<'a> HashStable<StableHashingContext<'a>> for hir::TraitItem<'_> {
194 fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
195 let hir::TraitItem { hir_id: _, ident, ref attrs, ref generics, ref kind, span } = *self;
197 hcx.hash_hir_item_like(|hcx| {
198 ident.name.hash_stable(hcx, hasher);
199 attrs.hash_stable(hcx, hasher);
200 generics.hash_stable(hcx, hasher);
201 kind.hash_stable(hcx, hasher);
202 span.hash_stable(hcx, hasher);
207 impl<'a> HashStable<StableHashingContext<'a>> for hir::ImplItem<'_> {
208 fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
220 hcx.hash_hir_item_like(|hcx| {
221 ident.name.hash_stable(hcx, hasher);
222 vis.hash_stable(hcx, hasher);
223 defaultness.hash_stable(hcx, hasher);
224 attrs.hash_stable(hcx, hasher);
225 generics.hash_stable(hcx, hasher);
226 kind.hash_stable(hcx, hasher);
227 span.hash_stable(hcx, hasher);
232 impl<'a> HashStable<StableHashingContext<'a>> for hir::Item<'_> {
233 fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
234 let hir::Item { ident, ref attrs, hir_id: _, ref kind, ref vis, span } = *self;
236 hcx.hash_hir_item_like(|hcx| {
237 ident.name.hash_stable(hcx, hasher);
238 attrs.hash_stable(hcx, hasher);
239 kind.hash_stable(hcx, hasher);
240 vis.hash_stable(hcx, hasher);
241 span.hash_stable(hcx, hasher);
246 impl<'a> HashStable<StableHashingContext<'a>> for hir::Body<'_> {
247 fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
248 let hir::Body { params, value, generator_kind } = self;
250 hcx.with_node_id_hashing_mode(NodeIdHashingMode::Ignore, |hcx| {
251 params.hash_stable(hcx, hasher);
252 value.hash_stable(hcx, hasher);
253 generator_kind.hash_stable(hcx, hasher);
258 impl<'a> ToStableHashKey<StableHashingContext<'a>> for hir::BodyId {
259 type KeyType = (DefPathHash, hir::ItemLocalId);
262 fn to_stable_hash_key(
264 hcx: &StableHashingContext<'a>,
265 ) -> (DefPathHash, hir::ItemLocalId) {
266 let hir::BodyId { hir_id } = *self;
267 hir_id.to_stable_hash_key(hcx)
271 impl<'a> HashStable<StableHashingContext<'a>> for hir::def_id::DefIndex {
272 fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
273 hcx.local_def_path_hash(*self).hash_stable(hcx, hasher);
277 impl<'a> ToStableHashKey<StableHashingContext<'a>> for hir::def_id::DefIndex {
278 type KeyType = DefPathHash;
281 fn to_stable_hash_key(&self, hcx: &StableHashingContext<'a>) -> DefPathHash {
282 hcx.local_def_path_hash(*self)
286 impl<'a> HashStable<StableHashingContext<'a>> for crate::middle::lang_items::LangItem {
287 fn hash_stable(&self, _: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
288 ::std::hash::Hash::hash(self, hasher);
292 impl<'a> HashStable<StableHashingContext<'a>> for hir::TraitCandidate {
293 fn hash_stable(&self, hcx: &mut StableHashingContext<'a>, hasher: &mut StableHasher) {
294 hcx.with_node_id_hashing_mode(NodeIdHashingMode::HashDefPath, |hcx| {
295 let hir::TraitCandidate { def_id, import_ids } = self;
297 def_id.hash_stable(hcx, hasher);
298 import_ids.hash_stable(hcx, hasher);
303 impl<'a> ToStableHashKey<StableHashingContext<'a>> for hir::TraitCandidate {
304 type KeyType = (DefPathHash, SmallVec<[(DefPathHash, hir::ItemLocalId); 1]>);
306 fn to_stable_hash_key(&self, hcx: &StableHashingContext<'a>) -> Self::KeyType {
307 let hir::TraitCandidate { def_id, import_ids } = self;
309 let import_keys = import_ids
311 .map(|node_id| hcx.node_to_hir_id(*node_id))
312 .map(|hir_id| (hcx.local_def_path_hash(hir_id.owner), hir_id.local_id))
314 (hcx.def_path_hash(*def_id), import_keys)
318 impl<'hir> HashStable<StableHashingContext<'hir>> for attr::InlineAttr {
319 fn hash_stable(&self, hcx: &mut StableHashingContext<'hir>, hasher: &mut StableHasher) {
320 mem::discriminant(self).hash_stable(hcx, hasher);
324 impl<'hir> HashStable<StableHashingContext<'hir>> for attr::OptimizeAttr {
325 fn hash_stable(&self, hcx: &mut StableHashingContext<'hir>, hasher: &mut StableHasher) {
326 mem::discriminant(self).hash_stable(hcx, hasher);